125 lines
3.4 KiB
C++
125 lines
3.4 KiB
C++
#pragma once
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#include "creeper-qt/utility/trait/widget.hh"
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#include "creeper-qt/utility/wrapper/common.hh"
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#include "creeper-qt/utility/wrapper/property.hh"
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namespace creeper::group::internal {
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template <typename F, typename T>
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concept foreach_invoke_item_trait = requires {
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{ std::invoke(std::declval<F>(), std::declval<T const&>()) } -> widget_pointer_trait;
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};
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template <typename F, typename T>
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concept foreach_apply_item_trait = requires {
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{ std::apply(std::declval<F>(), std::declval<T const&>()) } -> widget_pointer_trait;
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};
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template <typename F, typename T>
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concept foreach_item_trait = foreach_invoke_item_trait<F, T> || foreach_apply_item_trait<F, T>;
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template <typename R, typename F>
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concept foreach_invoke_ranges_trait = foreach_item_trait<F, std::ranges::range_value_t<R>>;
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template <layout_trait T, widget_trait W>
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struct Group : public T {
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using T::T;
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std::vector<W*> widgets;
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template <std::ranges::range R, typename F>
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requires foreach_invoke_ranges_trait<R, F>
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constexpr auto compose(const R& ranges, F&& f, Qt::Alignment a = {}) noexcept -> void {
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for (const auto& item : ranges) {
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using ItemT = decltype(item);
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auto widget_pointer = (W*) {};
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if constexpr (foreach_invoke_item_trait<F, ItemT>)
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widget_pointer = std::invoke(f, item);
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else if constexpr (foreach_apply_item_trait<F, ItemT>)
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widget_pointer = std::apply(f, item);
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if (widget_pointer != nullptr) {
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T::addWidget(widget_pointer, 0, a);
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widgets.push_back(widget_pointer);
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}
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}
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}
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auto foreach_(this auto&& self, auto&& f) noexcept
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requires std::invocable<decltype(f), W&>
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{
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for (auto widget : self.widgets)
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std::invoke(f, *widget);
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}
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};
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};
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namespace creeper::group::pro {
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using Token = common::Token<internal::Group<QLayout, QWidget>>;
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/// @note
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/// 一种典型的用法，委托构造时，所传函数只能接受常量引用，
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/// 放心使用 auto，类型是可以被推导出来的
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///
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/// group::pro::Compose {
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/// std::array {
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/// std::tuple(1, "xxxxxx"),
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/// ......
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/// },
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/// [](auto index, auto text) {
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/// return new TextButton { ... };
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/// },
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/// }
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///
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template <typename R, typename F>
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requires internal::foreach_invoke_ranges_trait<R, F>
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struct Compose : Token {
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const R& ranges;
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F method;
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Qt::Alignment alignment;
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explicit Compose(const R& r, F f, Qt::Alignment a = {}) noexcept
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: ranges { r }
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, method { std::move(f) }
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, alignment { a } { }
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auto apply(auto& self) noexcept -> void { //
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self.compose(ranges, std::move(method), alignment);
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}
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};
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/// @note
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/// 函数参数是组件的引用:
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///
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/// group::pro::Foreach { [](Widget& button) { ... } },
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///
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template <typename F>
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requires(!std::invocable<F>)
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struct Foreach : Token {
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F function;
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explicit Foreach(F&& f) noexcept
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: function { std::forward<F>(f) } { }
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auto apply(auto& self) const noexcept {
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// 很遗憾，Qt 占用了 foreach 这个单词
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self.foreach_(std::move(function));
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}
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};
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template <class T>
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concept trait = std::derived_from<T, Token>;
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CREEPER_DEFINE_CHECKER(trait)
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};
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namespace creeper {
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template <layout_trait T, widget_trait W>
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using Group =
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Declarative<group::internal::Group<T, W>, CheckerOr<group::pro::checker, typename T::Checker>>;
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}
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